Temp probe RPM Air Gap

fishy68 said

The one on the lower part of the picture does not go into the water jacket. It's a mounting boss for the carb return spring so it won't work

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^^ yeppers



I run my fan relay sensor in the top hole of your picture. I have a Derale sensor, their sensor is a real small thread like 1/4" then come with different fittings to adapt to fit different applications. Now my fan is just wired to its own relay and the Derale probe has a 12V power running to it and when the temp reaches 180* it trips the relay and turns on the fan.